I scared the crap out of a player that had never seen that "synergy" before. It scared him out of attacking at all! However, with the current version of the game, stealth + taunt has a special image that helps players see that the taunt is not active (it is faded and smokey.)
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BlackVegetableApr 19 '14 at 15:23

Update since the answer was posted: HS updated its visuals to reflect this. A taunt stealth minion will have have a faded shield, to indicate that the taunt is disabled.
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FlaterJun 20 '14 at 10:40